:root {
            --primary: #4CAF50;
            --secondary: #2196F3;
            --accent: #FFC107;
            --dark: #2E7D32;
            --light: #E8F5E9;
            --text: #333;
            --white: #ffffff;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.6;
            color: var(--text);
            background-color: #f9f9f9;
        }
        
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        /* 头部导航 */
        header {
            background-color: var(--white);
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
        .navbar {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        
        .logo {
            display: flex;
            align-items: center;
        }
        
        .logo img {
            height: 50px;
            margin-right: 10px;
        }
        
        .logo h1 {
            font-size: 24px;
            color: var(--dark);
        }
        
        .nav-links {
            display: flex;
            list-style: none;
        }
        
        .nav-links li {
            margin-left: 30px;
        }
        
        .nav-links a {
            text-decoration: none;
            color: var(--text);
            font-weight: 500;
            transition: color 0.3s;
        }
        
        .nav-links a:hover {
            color: var(--primary);
        }
        
        .mobile-menu {
            display: none;
            font-size: 24px;
            cursor: pointer;
        }
        
        /* 英雄区域 */
        .hero {
            background: linear-gradient(135deg, var(--light) 0%, #B2EBF2 100%);
            padding: 80px 0;
            display: flex;
            align-items: center;
        }
        
        .hero-content {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 40px;
        }
        
        .hero-text {
            flex: 1;
            min-width: 300px;
        }
        
        .hero-text h2 {
            font-size: 2.5rem;
            margin-bottom: 20px;
            color: var(--dark);
        }
        
        .hero-text p {
            font-size: 1.1rem;
            margin-bottom: 30px;
            max-width: 500px;
        }
        
        .download-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 15px;
        }
        
        .btn {
            display: inline-block;
            padding: 12px 25px;
            border-radius: 30px;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s;
            text-align: center;
        }
        
        .btn-primary {
            background-color: var(--primary);
            color: var(--white);
            border: 2px solid var(--primary);
        }
        
        .btn-primary:hover {
            background-color: transparent;
            color: var(--primary);
        }
        
        .btn-secondary {
            background-color: var(--secondary);
            color: var(--white);
            border: 2px solid var(--secondary);
        }
        
        .btn-secondary:hover {
            background-color: transparent;
            color: var(--secondary);
        }
        
        .hero-image {
            flex: 1;
            min-width: 300px;
            text-align: center;
        }
        
        .hero-image img {
            max-width: 100%;
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.15);
        }
        
        /* 功能区 */
        .section {
            padding: 80px 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 50px;
        }
        
        .section-title h2 {
            font-size: 2rem;
            color: var(--dark);
            position: relative;
            display: inline-block;
            padding-bottom: 15px;
        }
        
        .section-title h2::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 50%;
            transform: translateX(-50%);
            width: 70px;
            height: 3px;
            background-color: var(--primary);
        }
        
        .features {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
        }
        
        .feature-card {
            background: var(--white);
            border-radius: 10px;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            transition: transform 0.3s;
        }
        
        .feature-card:hover {
            transform: translateY(-10px);
        }
        
        .feature-icon {
            background-color: var(--light);
            padding: 30px;
            text-align: center;
            font-size: 48px;
            color: var(--primary);
        }
        
        .feature-content {
            padding: 25px;
        }
        
        .feature-content h3 {
            margin-bottom: 15px;
            color: var(--dark);
        }
        
        /* 下载区域 */
        .download-section {
            background-color: var(--light);
            text-align: center;
        }
        
        .download-options {
            display: flex;
            justify-content: center;
            flex-wrap: wrap;
            gap: 30px;
            margin-top: 40px;
        }
        
        .download-card {
            background: var(--white);
            border-radius: 10px;
            padding: 30px;
            width: 280px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
        }
        
        .download-card i {
            font-size: 48px;
            color: var(--secondary);
            margin-bottom: 20px;
        }
        
        .download-card h3 {
            margin-bottom: 15px;
            color: var(--dark);
        }
        
        /* 安装教程 */
        .steps {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 30px;
            margin-top: 40px;
        }
        
        .step {
            flex: 1;
            min-width: 250px;
            max-width: 350px;
            background: var(--white);
            border-radius: 10px;
            padding: 30px;
            box-shadow: 0 5px 15px rgba(0,0,0,0.05);
            position: relative;
        }
        
        .step-number {
            position: absolute;
            top: -20px;
            left: 50%;
            transform: translateX(-50%);
            width: 40px;
            height: 40px;
            background: var(--primary);
            color: var(--white);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            font-size: 20px;
        }
        
        .step h3 {
            margin: 20px 0 15px;
            color: var(--dark);
            text-align: center;
        }
        
        /* FAQ */
        .faq-container {
            max-width: 800px;
            margin: 0 auto;
        }
        
        .faq-item {
            margin-bottom: 20px;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 3px 10px rgba(0,0,0,0.08);
        }
        
        .faq-question {
            background-color: var(--white);
            padding: 20px;
            font-weight: 600;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .faq-answer {
            background-color: var(--light);
            padding: 0 20px;
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease, padding 0.3s ease;
        }
        
        .faq-item.active .faq-answer {
            padding: 20px;
            max-height: 500px;
        }
        
        /* 页脚 */
        footer {
            background-color: var(--dark);
            color: var(--white);
            padding: 50px 0 20px;
        }
        
        .footer-content {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        
        .footer-column h3 {
            margin-bottom: 20px;
            position: relative;
            padding-bottom: 10px;
        }
        
        .footer-column h3::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 40px;
            height: 2px;
            background-color: var(--accent);
        }
        
        .footer-links {
            list-style: none;
        }
        
        .footer-links li {
            margin-bottom: 10px;
        }
        
        .footer-links a {
            color: #ddd;
            text-decoration: none;
            transition: color 0.3s;
        }
        
        .footer-links a:hover {
            color: var(--accent);
        }
        
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            font-size: 0.9rem;
            color: #aaa;
        }
        
        /* 响应式设计 */
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            
            .mobile-menu {
                display: block;
            }
            
            .hero {
                padding: 50px 0;
            }
            
            .hero-text h2 {
                font-size: 2rem;
            }
            
            .section {
                padding: 60px 0;
            }
        }
        
        @media (max-width: 480px) {
            .btn {
                width: 100%;
            }
            
            .download-buttons {
                flex-direction: column;
            }
        }